Question

Let's start by assuming that RX= 1000, RA=2700?, RB=5400?,
RC=1500?, and VS=24V. The change in resistance is very small: if
the piece of steel the gauge is bonded to stretches by ?ll=0.001
the gauge increases resistance by only 2? 1) What is the output
voltage vO, in Volts, if the gauge is not deformed? 2) Now suppose
the gauge stretches so its resistance changes to RX=1002.0?. What
is the change in the output voltage, in milliVolts? 3) We would
really like the output voltage to be zero when the gauge is not
deformed. Keeping the other resistors the same, what should we make
the resistance RB to accomplish this? Express your answer in Ohms.
Now we want to choose some resistances to get the maximum
sensitivity: we want the biggest change in output voltage for a
change in the gauge resistance. We also want the output voltage to
be zero when the gauge is not deformed. 4) Assume that we are given
RA=3000.0?, and remember that the nominal undeformed resistance of
the gauge RX=1000?. What value should we choose for RC, in Ohms? 5)
What value should we choose for RB, in Ohms?